Hans Duffels's research while affiliated with Naturalis Biodiversity Center and other places

Publications (3)

Article
Full-text available
New data on the Heteroptera fauna of La Palma, Canary Islands (Insecta: Hemiptera). In: KMENT P., MALENOVSKÝ I. & KOLIBÁÈ J. (eds.): Studies in Hemiptera in honour of Pavel Lauterer and Jaroslav L. Stehlík. Acta Musei Moraviae, Scientiae biologicae (Brno) 98(2): 459–493. – Heteroptera collected on La Palma in the Canary Islands during the period 20...
Article
The genus Ayesha belongs to the tribe Dundubiini and is distinguished from other genera of the tribe by the spatulate and strongly overlapping male opercula. The synonymy of three species, Cosmopsaltria vomerigera Breddin, 1901, Dundubia lelita Kirkaldy, 1902 and Cicada elopurina Distant, 1888, which are treated as junior synonyms of A. serva (Walk...
Article
Full-text available
The song and the calling behaviour of the cicada Maua albigutta (WALKER, 1856) from S.E. Asia is described. The majority of the investigations has been carried out in the Endau Rompin National Park, Malaysia. The calling song comprises three main parts (A - C) with characteristic amplitude and especially in the third part with intense frequency mod...

Citations

...       So far, Oncocephalus squalidus (Rossi, 1790) (Heteroptera: Reduviidae) has been reported for the islands of La Palma and Tenerife (HEISS & BÁEZ, 1990;RIBES & RIBES, 1997;AUKEMA et al., 2006AUKEMA et al., , 2013ROCA-CUSACHS et al., 2020). Now, the island of Lanzarote can be added to the list of the distribution of O. squalidus on the Canary Islands: On 20-08-2021, an adult specimen ( Fig. 1) was photographed in the courtyard of a private house in Costa Teguise, located at the eastern coast of the island (see here). ...
... However, the ''tuned resonator'' alone cannot account for the very high levels of acoustic energy radiated by the relatively small animal (MacNally and Young 1980), which are mainly attributed to non-linear characteristics of the signal (Hughes et al. 2009). Singing animals can adjust the resonant properties by stretching and raising the abdomen, thus enlarging the resonant cavity inside as well as the room between thorax and abdomen (Gogala et al. 2004; Boulard 2006 ). Adjustment of the thorax–abdomen gap may increase the sound volume by tuning the cavity to the eigenfrequency of the tymbal plate, while dilatation of the abdomen might raise the sharpness of tuning and reduce the damping (Pringle 1954; Bennet-Clark and Young 1998). ...